/Engine/Source/Runtime/Engine/Classes/GameFramework/CharacterMovementComponent.h
Ack a given move. This move will become LastAckedMove, SavedMoves will be adjusted to only contain unAcked moves.
void AckMove ( int32 AckedMoveIndex, [UCharacterMovementComponent](API\Runtime\Engine\GameFramework\UCharacterMovementComponent) & CharacterMovementComponent )